Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_rd.c | |
3 | * | |
4 | * This file contains the Storage Engine <-> Ramdisk transport | |
5 | * specific functions. | |
6 | * | |
4c76251e | 7 | * (c) Copyright 2003-2013 Datera, Inc. |
c66ac9db NB |
8 | * |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
c66ac9db NB |
27 | #include <linux/string.h> |
28 | #include <linux/parser.h> | |
29 | #include <linux/timer.h> | |
c66ac9db NB |
30 | #include <linux/slab.h> |
31 | #include <linux/spinlock.h> | |
c66ac9db NB |
32 | #include <scsi/scsi.h> |
33 | #include <scsi/scsi_host.h> | |
34 | ||
35 | #include <target/target_core_base.h> | |
c4795fb2 | 36 | #include <target/target_core_backend.h> |
c66ac9db NB |
37 | |
38 | #include "target_core_rd.h" | |
39 | ||
0fd97ccf CH |
40 | static inline struct rd_dev *RD_DEV(struct se_device *dev) |
41 | { | |
42 | return container_of(dev, struct rd_dev, dev); | |
43 | } | |
c66ac9db | 44 | |
c66ac9db NB |
45 | /* rd_attach_hba(): (Part of se_subsystem_api_t template) |
46 | * | |
47 | * | |
48 | */ | |
49 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) | |
50 | { | |
51 | struct rd_host *rd_host; | |
52 | ||
53 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); | |
6708bb27 AG |
54 | if (!rd_host) { |
55 | pr_err("Unable to allocate memory for struct rd_host\n"); | |
c66ac9db NB |
56 | return -ENOMEM; |
57 | } | |
58 | ||
59 | rd_host->rd_host_id = host_id; | |
60 | ||
5951146d | 61 | hba->hba_ptr = rd_host; |
c66ac9db | 62 | |
6708bb27 | 63 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
c66ac9db NB |
64 | " Generic Target Core Stack %s\n", hba->hba_id, |
65 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
66 | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static void rd_detach_hba(struct se_hba *hba) | |
71 | { | |
72 | struct rd_host *rd_host = hba->hba_ptr; | |
73 | ||
6708bb27 | 74 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
c66ac9db NB |
75 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
76 | ||
77 | kfree(rd_host); | |
78 | hba->hba_ptr = NULL; | |
79 | } | |
80 | ||
81 | /* rd_release_device_space(): | |
82 | * | |
83 | * | |
84 | */ | |
85 | static void rd_release_device_space(struct rd_dev *rd_dev) | |
86 | { | |
87 | u32 i, j, page_count = 0, sg_per_table; | |
88 | struct rd_dev_sg_table *sg_table; | |
89 | struct page *pg; | |
90 | struct scatterlist *sg; | |
91 | ||
92 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) | |
93 | return; | |
94 | ||
95 | sg_table = rd_dev->sg_table_array; | |
96 | ||
97 | for (i = 0; i < rd_dev->sg_table_count; i++) { | |
98 | sg = sg_table[i].sg_table; | |
99 | sg_per_table = sg_table[i].rd_sg_count; | |
100 | ||
101 | for (j = 0; j < sg_per_table; j++) { | |
102 | pg = sg_page(&sg[j]); | |
6708bb27 | 103 | if (pg) { |
c66ac9db NB |
104 | __free_page(pg); |
105 | page_count++; | |
106 | } | |
107 | } | |
108 | ||
109 | kfree(sg); | |
110 | } | |
111 | ||
6708bb27 | 112 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
c66ac9db NB |
113 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
114 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, | |
115 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); | |
116 | ||
117 | kfree(sg_table); | |
118 | rd_dev->sg_table_array = NULL; | |
119 | rd_dev->sg_table_count = 0; | |
120 | } | |
121 | ||
122 | ||
123 | /* rd_build_device_space(): | |
124 | * | |
125 | * | |
126 | */ | |
127 | static int rd_build_device_space(struct rd_dev *rd_dev) | |
128 | { | |
129 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; | |
130 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / | |
131 | sizeof(struct scatterlist)); | |
132 | struct rd_dev_sg_table *sg_table; | |
133 | struct page *pg; | |
134 | struct scatterlist *sg; | |
135 | ||
136 | if (rd_dev->rd_page_count <= 0) { | |
6708bb27 | 137 | pr_err("Illegal page count: %u for Ramdisk device\n", |
c66ac9db | 138 | rd_dev->rd_page_count); |
065f9716 | 139 | return -EINVAL; |
c66ac9db | 140 | } |
670caa9f AG |
141 | |
142 | /* Don't need backing pages for NULLIO */ | |
143 | if (rd_dev->rd_flags & RDF_NULLIO) | |
144 | return 0; | |
145 | ||
c66ac9db NB |
146 | total_sg_needed = rd_dev->rd_page_count; |
147 | ||
148 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; | |
149 | ||
150 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); | |
6708bb27 AG |
151 | if (!sg_table) { |
152 | pr_err("Unable to allocate memory for Ramdisk" | |
c66ac9db | 153 | " scatterlist tables\n"); |
065f9716 | 154 | return -ENOMEM; |
c66ac9db NB |
155 | } |
156 | ||
157 | rd_dev->sg_table_array = sg_table; | |
158 | rd_dev->sg_table_count = sg_tables; | |
159 | ||
160 | while (total_sg_needed) { | |
161 | sg_per_table = (total_sg_needed > max_sg_per_table) ? | |
162 | max_sg_per_table : total_sg_needed; | |
163 | ||
164 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), | |
165 | GFP_KERNEL); | |
6708bb27 AG |
166 | if (!sg) { |
167 | pr_err("Unable to allocate scatterlist array" | |
c66ac9db | 168 | " for struct rd_dev\n"); |
065f9716 | 169 | return -ENOMEM; |
c66ac9db NB |
170 | } |
171 | ||
6708bb27 | 172 | sg_init_table(sg, sg_per_table); |
c66ac9db NB |
173 | |
174 | sg_table[i].sg_table = sg; | |
175 | sg_table[i].rd_sg_count = sg_per_table; | |
176 | sg_table[i].page_start_offset = page_offset; | |
177 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) | |
178 | - 1; | |
179 | ||
180 | for (j = 0; j < sg_per_table; j++) { | |
181 | pg = alloc_pages(GFP_KERNEL, 0); | |
6708bb27 AG |
182 | if (!pg) { |
183 | pr_err("Unable to allocate scatterlist" | |
c66ac9db | 184 | " pages for struct rd_dev_sg_table\n"); |
065f9716 | 185 | return -ENOMEM; |
c66ac9db NB |
186 | } |
187 | sg_assign_page(&sg[j], pg); | |
188 | sg[j].length = PAGE_SIZE; | |
189 | } | |
190 | ||
191 | page_offset += sg_per_table; | |
192 | total_sg_needed -= sg_per_table; | |
193 | } | |
194 | ||
6708bb27 | 195 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
c66ac9db NB |
196 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
197 | rd_dev->rd_dev_id, rd_dev->rd_page_count, | |
198 | rd_dev->sg_table_count); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
0fd97ccf | 203 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
204 | { |
205 | struct rd_dev *rd_dev; | |
206 | struct rd_host *rd_host = hba->hba_ptr; | |
207 | ||
208 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); | |
6708bb27 AG |
209 | if (!rd_dev) { |
210 | pr_err("Unable to allocate memory for struct rd_dev\n"); | |
c66ac9db NB |
211 | return NULL; |
212 | } | |
213 | ||
214 | rd_dev->rd_host = rd_host; | |
c66ac9db | 215 | |
0fd97ccf | 216 | return &rd_dev->dev; |
c66ac9db NB |
217 | } |
218 | ||
0fd97ccf | 219 | static int rd_configure_device(struct se_device *dev) |
c66ac9db | 220 | { |
0fd97ccf CH |
221 | struct rd_dev *rd_dev = RD_DEV(dev); |
222 | struct rd_host *rd_host = dev->se_hba->hba_ptr; | |
223 | int ret; | |
c66ac9db | 224 | |
0fd97ccf CH |
225 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
226 | pr_debug("Missing rd_pages= parameter\n"); | |
227 | return -EINVAL; | |
228 | } | |
c66ac9db | 229 | |
065f9716 DC |
230 | ret = rd_build_device_space(rd_dev); |
231 | if (ret < 0) | |
c66ac9db NB |
232 | goto fail; |
233 | ||
0fd97ccf CH |
234 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
235 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
236 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; | |
c66ac9db NB |
237 | |
238 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; | |
c66ac9db | 239 | |
8feb58d0 | 240 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
c66ac9db | 241 | " %u pages in %u tables, %lu total bytes\n", |
8feb58d0 | 242 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
c66ac9db NB |
243 | rd_dev->sg_table_count, |
244 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); | |
245 | ||
0fd97ccf | 246 | return 0; |
c66ac9db NB |
247 | |
248 | fail: | |
249 | rd_release_device_space(rd_dev); | |
0fd97ccf | 250 | return ret; |
c66ac9db NB |
251 | } |
252 | ||
0fd97ccf | 253 | static void rd_free_device(struct se_device *dev) |
c66ac9db | 254 | { |
0fd97ccf | 255 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
256 | |
257 | rd_release_device_space(rd_dev); | |
258 | kfree(rd_dev); | |
259 | } | |
260 | ||
c66ac9db NB |
261 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
262 | { | |
c66ac9db | 263 | struct rd_dev_sg_table *sg_table; |
8f67835f MS |
264 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
265 | sizeof(struct scatterlist)); | |
c66ac9db | 266 | |
8f67835f MS |
267 | i = page / sg_per_table; |
268 | if (i < rd_dev->sg_table_count) { | |
c66ac9db NB |
269 | sg_table = &rd_dev->sg_table_array[i]; |
270 | if ((sg_table->page_start_offset <= page) && | |
271 | (sg_table->page_end_offset >= page)) | |
272 | return sg_table; | |
273 | } | |
274 | ||
6708bb27 | 275 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
c66ac9db NB |
276 | page); |
277 | ||
278 | return NULL; | |
279 | } | |
280 | ||
de103c93 | 281 | static sense_reason_t |
a82a9538 NB |
282 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
283 | enum dma_data_direction data_direction) | |
c66ac9db | 284 | { |
5787cacd | 285 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 286 | struct rd_dev *dev = RD_DEV(se_dev); |
c66ac9db | 287 | struct rd_dev_sg_table *table; |
65b0c78d SAS |
288 | struct scatterlist *rd_sg; |
289 | struct sg_mapping_iter m; | |
8feb58d0 CH |
290 | u32 rd_offset; |
291 | u32 rd_size; | |
292 | u32 rd_page; | |
65b0c78d | 293 | u32 src_len; |
8feb58d0 | 294 | u64 tmp; |
c66ac9db | 295 | |
52c07423 NB |
296 | if (dev->rd_flags & RDF_NULLIO) { |
297 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
298 | return 0; | |
299 | } | |
300 | ||
0fd97ccf | 301 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
8feb58d0 CH |
302 | rd_offset = do_div(tmp, PAGE_SIZE); |
303 | rd_page = tmp; | |
5787cacd | 304 | rd_size = cmd->data_length; |
8feb58d0 CH |
305 | |
306 | table = rd_get_sg_table(dev, rd_page); | |
6708bb27 | 307 | if (!table) |
de103c93 | 308 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db | 309 | |
8feb58d0 | 310 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
6708bb27 | 311 | |
65b0c78d | 312 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
8feb58d0 | 313 | dev->rd_dev_id, |
5787cacd CH |
314 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
315 | cmd->t_task_lba, rd_size, rd_page, rd_offset); | |
c66ac9db | 316 | |
65b0c78d | 317 | src_len = PAGE_SIZE - rd_offset; |
5787cacd CH |
318 | sg_miter_start(&m, sgl, sgl_nents, |
319 | data_direction == DMA_FROM_DEVICE ? | |
8feb58d0 CH |
320 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
321 | while (rd_size) { | |
65b0c78d SAS |
322 | u32 len; |
323 | void *rd_addr; | |
c66ac9db | 324 | |
65b0c78d | 325 | sg_miter_next(&m); |
bbf344e5 HR |
326 | if (!(u32)m.length) { |
327 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", | |
328 | dev->rd_dev_id, m.addr, m.length); | |
329 | sg_miter_stop(&m); | |
330 | return TCM_INCORRECT_AMOUNT_OF_DATA; | |
331 | } | |
65b0c78d | 332 | len = min((u32)m.length, src_len); |
bbf344e5 HR |
333 | if (len > rd_size) { |
334 | pr_debug("RD[%u]: size underrun page %d offset %d " | |
335 | "size %d\n", dev->rd_dev_id, | |
336 | rd_page, rd_offset, rd_size); | |
337 | len = rd_size; | |
338 | } | |
65b0c78d | 339 | m.consumed = len; |
c66ac9db | 340 | |
65b0c78d | 341 | rd_addr = sg_virt(rd_sg) + rd_offset; |
6708bb27 | 342 | |
5787cacd | 343 | if (data_direction == DMA_FROM_DEVICE) |
65b0c78d SAS |
344 | memcpy(m.addr, rd_addr, len); |
345 | else | |
346 | memcpy(rd_addr, m.addr, len); | |
c66ac9db | 347 | |
8feb58d0 CH |
348 | rd_size -= len; |
349 | if (!rd_size) | |
c66ac9db NB |
350 | continue; |
351 | ||
65b0c78d SAS |
352 | src_len -= len; |
353 | if (src_len) { | |
354 | rd_offset += len; | |
c66ac9db NB |
355 | continue; |
356 | } | |
6708bb27 | 357 | |
65b0c78d | 358 | /* rd page completed, next one please */ |
8feb58d0 | 359 | rd_page++; |
65b0c78d SAS |
360 | rd_offset = 0; |
361 | src_len = PAGE_SIZE; | |
8feb58d0 | 362 | if (rd_page <= table->page_end_offset) { |
65b0c78d | 363 | rd_sg++; |
c66ac9db NB |
364 | continue; |
365 | } | |
6708bb27 | 366 | |
8feb58d0 | 367 | table = rd_get_sg_table(dev, rd_page); |
65b0c78d SAS |
368 | if (!table) { |
369 | sg_miter_stop(&m); | |
de103c93 | 370 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
65b0c78d | 371 | } |
c66ac9db | 372 | |
65b0c78d SAS |
373 | /* since we increment, the first sg entry is correct */ |
374 | rd_sg = table->sg_table; | |
c66ac9db | 375 | } |
65b0c78d | 376 | sg_miter_stop(&m); |
c66ac9db | 377 | |
5787cacd | 378 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 379 | return 0; |
c66ac9db NB |
380 | } |
381 | ||
c66ac9db | 382 | enum { |
52c07423 | 383 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
c66ac9db NB |
384 | }; |
385 | ||
386 | static match_table_t tokens = { | |
387 | {Opt_rd_pages, "rd_pages=%d"}, | |
52c07423 | 388 | {Opt_rd_nullio, "rd_nullio=%d"}, |
c66ac9db NB |
389 | {Opt_err, NULL} |
390 | }; | |
391 | ||
0fd97ccf CH |
392 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
393 | const char *page, ssize_t count) | |
c66ac9db | 394 | { |
0fd97ccf | 395 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db NB |
396 | char *orig, *ptr, *opts; |
397 | substring_t args[MAX_OPT_ARGS]; | |
398 | int ret = 0, arg, token; | |
399 | ||
400 | opts = kstrdup(page, GFP_KERNEL); | |
401 | if (!opts) | |
402 | return -ENOMEM; | |
403 | ||
404 | orig = opts; | |
405 | ||
90c161b6 | 406 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
407 | if (!*ptr) |
408 | continue; | |
409 | ||
410 | token = match_token(ptr, tokens, args); | |
411 | switch (token) { | |
412 | case Opt_rd_pages: | |
413 | match_int(args, &arg); | |
414 | rd_dev->rd_page_count = arg; | |
6708bb27 | 415 | pr_debug("RAMDISK: Referencing Page" |
c66ac9db NB |
416 | " Count: %u\n", rd_dev->rd_page_count); |
417 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; | |
418 | break; | |
52c07423 NB |
419 | case Opt_rd_nullio: |
420 | match_int(args, &arg); | |
421 | if (arg != 1) | |
422 | break; | |
423 | ||
424 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); | |
425 | rd_dev->rd_flags |= RDF_NULLIO; | |
426 | break; | |
c66ac9db NB |
427 | default: |
428 | break; | |
429 | } | |
430 | } | |
431 | ||
432 | kfree(orig); | |
433 | return (!ret) ? count : ret; | |
434 | } | |
435 | ||
0fd97ccf | 436 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 437 | { |
0fd97ccf | 438 | struct rd_dev *rd_dev = RD_DEV(dev); |
c66ac9db | 439 | |
8feb58d0 CH |
440 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
441 | rd_dev->rd_dev_id); | |
c66ac9db | 442 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
52c07423 NB |
443 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
444 | PAGE_SIZE, rd_dev->sg_table_count, | |
445 | !!(rd_dev->rd_flags & RDF_NULLIO)); | |
c66ac9db NB |
446 | return bl; |
447 | } | |
448 | ||
c66ac9db NB |
449 | static sector_t rd_get_blocks(struct se_device *dev) |
450 | { | |
0fd97ccf CH |
451 | struct rd_dev *rd_dev = RD_DEV(dev); |
452 | ||
c66ac9db | 453 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
0fd97ccf | 454 | dev->dev_attrib.block_size) - 1; |
c66ac9db NB |
455 | |
456 | return blocks_long; | |
457 | } | |
458 | ||
9e999a6c | 459 | static struct sbc_ops rd_sbc_ops = { |
0c2ad7d1 CH |
460 | .execute_rw = rd_execute_rw, |
461 | }; | |
462 | ||
de103c93 CH |
463 | static sense_reason_t |
464 | rd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 465 | { |
9e999a6c | 466 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
0c2ad7d1 CH |
467 | } |
468 | ||
c66ac9db NB |
469 | static struct se_subsystem_api rd_mcp_template = { |
470 | .name = "rd_mcp", | |
0fd97ccf CH |
471 | .inquiry_prod = "RAMDISK-MCP", |
472 | .inquiry_rev = RD_MCP_VERSION, | |
c66ac9db NB |
473 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, |
474 | .attach_hba = rd_attach_hba, | |
475 | .detach_hba = rd_detach_hba, | |
0fd97ccf CH |
476 | .alloc_device = rd_alloc_device, |
477 | .configure_device = rd_configure_device, | |
c66ac9db | 478 | .free_device = rd_free_device, |
0c2ad7d1 | 479 | .parse_cdb = rd_parse_cdb, |
c66ac9db NB |
480 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
481 | .show_configfs_dev_params = rd_show_configfs_dev_params, | |
6f23ac8a | 482 | .get_device_type = sbc_get_device_type, |
c66ac9db NB |
483 | .get_blocks = rd_get_blocks, |
484 | }; | |
485 | ||
486 | int __init rd_module_init(void) | |
487 | { | |
488 | int ret; | |
489 | ||
c66ac9db NB |
490 | ret = transport_subsystem_register(&rd_mcp_template); |
491 | if (ret < 0) { | |
c66ac9db NB |
492 | return ret; |
493 | } | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | void rd_module_exit(void) | |
499 | { | |
c66ac9db NB |
500 | transport_subsystem_release(&rd_mcp_template); |
501 | } |